... the biggest risk you face is showing off your capability to the locals.
My own experience and the opinion of those (business people) I spoke to is that the Chinese don't really care if you are using VPN of some sort, as long as they don't suspect you are involve in some kind of dissidence or other "subversive" activity.
For what it's worth, I have used SSH tunnelling to my own tinyproxy installation. I enjoyed moderately high speed from my hotel rooms and from Starbucks.
Incidentally, I didn't set this up to bypass censorship. I use the proxy any time I am at a wireless hotspot for obvious security reasons. It also enables me to use my credit card overseas without being flagged as a risk because as my IP address always jives with my credit card postal address.